Celtic are eyeing another multi-million pound transfer window bonanza - and for a player who's not even on their books any more.

Celtic are eyeing another multi-million pound transfer window bonanza - and for a player who's not even on their books any more.

Moussa Dembele is the man in question as Juventus weigh-up a move for the free-scoring Lyon striker.

Dembele became the most expensive player in Scottish football 12 months ago when he completed a move from Celtic to Lyon for just under £20million.

Of course that record was smashed earlier this month when Celtic raked in £25million for Kieran Tierney as the left-back moved on to Arsenal.

But now the Hoops could be in line for another windfall if Dembele does indeed make the move from Lyon in the next two weeks.

As with all major deals, Celtic inserted a sell-on clause in the deal that took the 23-year-old from Parkhead to the south east of France last summer.

Speaking on the Transfer Window podcast back in June, journalist Duncan Castles revealed the percentages in that deal.

He said: "He's one of a very small group of strikers that are big, good in the air, also good on the deck and can score goals in various different ways. You can see the attraction.

"He's very much in play, so it's an interesting one for Celtic as they sold him for 22 million Euros, but they have a profit-clause in that deal in that they will take, I'm told, between 10 per cent and 15 per cent of any profit should he be sold by Lyon during his current contract."

With Dembele now valued at £40m by Lyon after hitting 28 goals in 35 starts for the Ligue 1 giants that would see the Hoops rake in a small fortune of between £2-3million.

The "profit clause" is the percentage of the profit figure which, if Dembele was sold for £40m, would stand at just over £20m.

The Frenchman still has four years left on his contract at Lyon.

Juventus sent scouts to watch the forward bag a brace in Lyon's 6-0 win over Angers on Friday as he made it 28 goals in 35 starts for the Ligue 1 side.

Maurizio Sarri's side have given up their pursuit of Inter Milan talisman Mauro Icardi and have turned their attentions to Dembele, who cannot now sign for admirers Manchester United and Arsenal because the English transfer window is closed.

Earlier this summer, Dembele and Lyon's president insisted he would see out the season in France, where his club are trying to wrestle the title away from PSG.

But cash-rich Juventus, who have already spent £165 million this summer, could make Lyon and Dembele an offer they can't refuse before the end of the Italian transfer window on September 2.